Most likely the answer is open a service request.

running ZDC against my database Zenworks 2017.1 (Window Server 2012) results in
ERROR Missing Table 'zStageFolder'
Detail:
Name: zStageFolder
Columns:
Name: ZUID, Size: 16, Type: BINARY, Nullable: false
Triggers:
Indexes:
As well as a ton of Missing Files in the systemfiles report

Things are working well I just have a few machines that do not update.